Sigmoid Sinus

Sigmoid Sinus

“What is the sigmoid sinus? A detailed question and answers guide”

Question 1. Sigmoid sinus
Answer:

• It is S-shaped paired sinus
• It is direct continuation of the transverse sinus

Extend:

• From the posteroinferior angle of the parietal bone to the posterior part of the jugular foramen

Tributaries:

• Mastoid and condylar emissary vein
• Cerebellar vein
• Internal auditory vein

Applied aspect:

• Thrombosis of the sigmoid sinus is always secondary to infection of middle ear
• Spread of infection or thrombosis from sigmoid sinus to superior sagittal sinus causes impaired CSF drainage into superior sagittal sinus leading to hydrocephalus

“Understanding the sigmoid sinus through FAQs: Composition, functions, and uses explained”

Question 2. Inferior sagittal sinus
Answer:

It is an unpaired sinus

Location:

• Lies in the posterior two third of the lower, concave free margin of the falx cerebri superior to Corpus callosum.
• It drains to the straight sinus by joining the great cerebral veins
• It receives blood from the deep and medial aspects of the cerebral hemispheres
• It is of a cylindrical form, increases in size as it passes backwards
• It is smaller and inconstant

“Importance of studying the sigmoid sinus for medical students: Questions explained”

“Common challenges in mastering sigmoid sinus notes effectively: FAQs provided”

Question 3. Definition, attachment and sinuses enclosed by falx cerebri.
Answer:

Falx Cerebri:

• It is large sickle shaped fold of duramater.

Attachments:

“Factors influencing success with sigmoid sinus studies: Q&A”

Sinuses enclosed by it:

• Straight sinus
• Inferior sagittal sinus
• Straight sinus